I dappled into mining bitcoin and ethereum back in 2017. My bitcoin miners were bitmain ASIC S9, and my ethereum were custom built with 12 graphic cards. They were noisy and consumed a lot of energy, we were paying $1200 a month on electricity, lol. When bitcoin tanked, I sold them off for 1/10 what I paid.
You can buy some bitmain S9 for cheap, about $300, and you can earn about $3-5 a day with it. That how I would start.